Plots of pressure vs temperature for three different gas samples extrapolate to absolute zero. The constant volume gas thermometer plays a crucial role in understanding how could be discovered long before the advent of. Consider a graph of pressure versus temperature made not far from standard conditions (well above absolute zero) for three different samples of any ideal gas (a, b, c). To the extent that the gas is ideal, the pressure depends linearly on temperature, and the extrapolation to zero pressure occurs at absolute zero.
Temperature Ranges of Application 3. Constant Volume Thermometer 4. Thermocouples 5. Thermometer Time. Temperature •Pressure is a force applied to an area, so its measure. Separated by the H2 gas from a constant T heat-sink Metal film is both heater and thermometer Qtotal=QH2 conduction. Thermometer may be chosen to be the change in pressure of a gas kept at constant volume, or the change in volume of a gas kept at constant pressure. Since it is easier to measure accurately change in pressure than it is to measure change in volume, constant-volume gas thermometers are more common in use than constant-pressure gas thermometers.
Note that data could have been collected with three different amounts of the same gas, which would have rendered this experiment easy to do in the eighteenth century.
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